Focusing Lens Assembly, Req. 1 inch Dia. Lens, 1.5 inch Series Flanges

The 77330 Focusing Lens Assembly is a useful accessory for Oriel Monochromators and Spectrographs. It re-images a source onto the instrument’s input slit, or images the monochromator output onto a detector, fiber or sample. It lacks X-Y image adjustment, so it is best used in arrangements where precision alignment is not required (e.g. large source and targets), or where the adjustments are already available (as in our Oriel Research Lamp Housings). The 77330 accepts any 1 inch (25.4 mm) diameter lens, but does not include the lens. The clear aperture is 0.8 inches (20 mm). The 77330 holds a single lens, housed inside a lens barrel with a focusing sleeve. A manual focusing lever moves the lens. Tapped holes in the lens barrel let you set the range of the lever adjust; this combination results in a total lens adjustment range of 2.9 inches (74 mm). The 77330 has a 1.5 Inch Series female and male flange so you can mount it directly to monochromators and other instruments. Beam paths are enclosed and optical axes are aligned. For most imaging applications, we recommend a 32 mm focal length lens, as shown in Fig. 2. The distance from the flange to the slit plane on our monochromators and spectrographs is 0.74 inch (19 mm). With a 32 mm focal length lens, the F/# of the focused beam is F/4.